I had the same issue after I switched to AF. My nitrates rose from 0 to 30 ppm after a couple of weeks of using Pro Bio S/NP Pro/Zeomix. My nutrients (NO3: 30ppm PO4: 0) sat there for 3 weeks.
I did 25% weekly WC to lower my NO3 level and continue dosing Pro Bio S/NP Pro. I must admit I almost give up after 2 weeks though I didn't noticed anything odd with my corals except that my yellow green monti turned darker green.
Until last week my NO3 dropped to 10ppm to undetectable 2 days ago. I noticed that my skimate turned darker and darker and indication that the bacteria now took over.
I'm dosing KNO3 now for 2 straight days now and feeding heavily to balance the system.
How long have you been using AF? Do you use Zeomix?
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